Clone

git clone https://git.jun.sh/rasterizer.git

Screenshots

Screenshots from the rasterizer, still a WIP.

Interactive software rasterizer written in C++, just to grok some GPU pipeline rendering, associated graphics APIs and math. Attempts to do things more classically in the GPU way. Like a depth buffer instead of sorting, Pineda-style edge triangle rasterization, homogeneous clipping, and floating-point math instead of ints.

The rasterizer outputs to a color buffer that’s blitted to the screen by SDL_UpdateTexture().
Primitive assembly -> backface culling -> early near plane rejection -> frustum culling.
Clipping -> NDC and perspective -> depth test -> rasterize -> color buffer.
The math and the pipeline is handled internally. SDL handles window creation, input events and window surface updates.
Some clarity on conventions, this uses a right-handed Z-up coordinate system. So X+ is forward, Y- is right and Z+ is up. The math is all in row-major matrices and row vectors. So v' = v \* m.
Currently the scene is hardcoded, just some .obj files that are parsed and loaded at runtime. No textures as of right now.
There is some initial perspective correct interpolation. I’ve only validated it with debug textures/patterns seems to check out though.
Contains a free cam and mouselook, typical [W][A][S][D] and [Q][E] for +Z, -Z respectively.

Local setup

Build script for each platform, acquiring SDL is skipped. -r for the release build.

Windows

.\build_win32.bat

Linux

./build_linux.sh

MacOS

./build_macos.sh

/assets holds the meshes. Scene composition is handled manually in initialize_scene().

To-do

Texture sampling
Transparency and alpha blending
Shading
SIMD/Autovec

rasterizer

Clone

Screenshots

Overview

Local setup

To-do

Resources